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Roll the WebXR sample repo to pick up a framebuffer scale fix.

TBR=bajones@chromium.org

Bug: 853400
Change-Id: Ic6880944037ace9fed199e647c04708aec0851af
Reviewed-on: https://chromium-review.googlesource.com/1123642Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572077}